Here's an example. You pay $4,000 for a hundred Morgan dollars, which works out to $40 each. A week later you find a Carson City Morgan in the pile and decide it cost you $395. If the other 99 coins stay at $40 each, your records now add up to $4,355, which is $355 more than you actually paid. Every profit number after that is off, and you'd have no way of knowing by how much.
The app fixes this by moving the cost along with the coin. When you pull a coin out of a lot, you give it the cost you think is fair, and the coins still in the lot share whatever is left. If you leave the cost blank, the coin takes an equal share.
No matter how you sort a lot, the coins always add back up to exactly what you paid, down to the cent.
Lots bought by face value work the same way. If you pull a Barber half out of a $250 face value bag of junk silver, the bag keeps the rest of the cost. You can undo any split, and every coin remembers which lot it came from.







